IRLL2703TR N-Channel 30V 3.9A MOSFET Equivalent & Substitute Parts

Part Overview

The IRLL2703TR is an N-Channel MOSFET manufactured by Infineon Technologies, designed for surface mount applications in the SOT-223 package. This device operates at 30V drain-to-source voltage with a continuous drain current rating of 3.9A at 25°C and a maximum power dissipation of 1W. The IRLL2703TR is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support, production continuity, and component sourcing.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	3.9	A
On-State Resistance (Rds On) @ 10V	45	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.4	V
Power Dissipation (Max)	1	W
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-223	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the IRLL2703TR is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Criteria:

Drain to Source Voltage (Vdss): 30V minimum
Package Type: SOT-223 or TO-261-4 compatible footprint
Mounting Type: Surface Mount
FET Type: N-Channel MOSFET

Performance Compatibility Criteria:

Continuous Drain Current (Id): Equal to or greater than 3.9A
On-State Resistance (Rds On): Equal to or lower than 45mOhm @ 10V
Gate Threshold Voltage (Vgs(th)): Within ±16V maximum gate voltage specification
Operating Temperature Range: Minimum -55°C to 150°C

The substitute parts NDT451AN and STN4NF03L meet all mandatory criteria and provide equal or superior electrical performance characteristics, enabling direct functional replacement in applications previously designed for the IRLL2703TR.

Parameter Comparison

Parameter	IRLL2703TR (Infineon)	NDT451AN (onsemi)	STN4NF03L (STMicroelectronics)
Drain to Source Voltage (Vdss)	30V	30V	30V
Continuous Drain Current (Id) @ 25°C	3.9A	7.2A	6.5A
Rds On (Max) @ 10V	45mOhm	35mOhm	50mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.4V	3V	1V
Power Dissipation (Max)	1W	3W	3.3W
Operating Temperature Range	-55 to 150°C	-65 to 150°C	-55 to 150°C
Package Type	SOT-223	SOT-223-4	SOT-223
Vgs (Max)	±16V	±20V	±16V
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

NDT451AN (onsemi): The NDT451AN is an active product with ROHS3 compliance and superior electrical performance. It provides 7.2A continuous drain current, 35mOhm on-state resistance, and 3W power dissipation—all exceeding the IRLL2703TR specifications. The extended temperature range (-65 to 150°C) and higher gate voltage rating (±20V) provide additional design margin. This part is recommended for new designs and production continuity where component availability and regulatory compliance are priorities.

STN4NF03L (STMicroelectronics): The STN4NF03L is an active product with ROHS3 compliance and the STripFET™ II series designation. It delivers 6.5A continuous drain current and 3.3W power dissipation, both exceeding IRLL2703TR ratings. The 50mOhm on-state resistance is marginally higher but remains within acceptable substitution parameters. The lower gate threshold voltage (1V @ 250µA) compared to the IRLL2703TR (2.4V) may require circuit evaluation in gate-drive-sensitive applications. This part is suitable for direct replacement in existing designs with established supply chains.

Both substitute parts are manufactured by established semiconductor suppliers with active product status and current regulatory compliance certifications, ensuring long-term availability and support.

Frequently Asked Questions (FAQ)

Q: Can the NDT451AN or STN4NF03L be used as direct pin-for-pin replacements for the IRLL2703TR?

A: Both substitute parts are compatible with the SOT-223 package footprint and share identical pin configurations (Gate, Drain, Source, Drain). Physical and electrical pin compatibility is confirmed. However, circuit board layout and thermal management should be evaluated, as the substitute parts have higher power dissipation ratings (3W vs. 1W).

Q: What is the primary reason for substituting the IRLL2703TR?

A: The IRLL2703TR is classified as obsolete. The NDT451AN and STN4NF03L are active products with established supply chains, ensuring component availability for production and maintenance applications.

Q: Are there differences in gate drive requirements between these parts?

A: The gate threshold voltages differ: IRLL2703TR (2.4V), NDT451AN (3V), and STN4NF03L (1V). Existing gate drive circuits designed for the IRLL2703TR will function with both substitutes, but applications with marginal gate drive voltage should be evaluated, particularly for the STN4NF03L due to its lower threshold voltage.

Q: Do the substitute parts meet current regulatory requirements?

A: Yes. Both NDT451AN and STN4NF03L are ROHS3 compliant, whereas the IRLL2703TR is RoHS non-compliant. This makes the substitutes suitable for applications requiring current environmental and regulatory compliance.

Q: What is the impact of higher on-state resistance in the STN4NF03L?

A: The STN4NF03L has 50mOhm on-state resistance compared to the IRLL2703TR's 45mOhm. This 11% increase results in proportionally higher conduction losses. For applications with tight thermal budgets or high switching frequencies, the NDT451AN (35mOhm) is the preferred substitute.

Q: Are there inventory considerations for these substitutes?

A: The NDT451AN has 40,900 pieces in stock, and the STN4NF03L has 77,761 pieces in stock, both significantly exceeding the IRLL2703TR's 839 pieces. This ensures reliable long-term availability for production and design support.

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